Furnace reconstruction



Q July 25, 1944. VAN 0055 ETAL 2,354,561

FURNACE RECONSTRUCTION Filed July 14. 1941 lib, m

G m Z? fir e NJ Mwqfl 2 E0 R M/ D IIIIIA'IIIIIHIIIIIIIIIII Patented July 25, 1944 UNIT D STATE FURNACE RECONSTRUCTION,

' al Van Hoose, Belleville, and Robertl Harding;

- East St. Louis,

, Applicationluly 14, 1941, Serial No. 402,274

1 Claim. (01. 116-438) This, invention relatesv generally to improvements in heating devices, but more "particularly to the smokeless burning of low-cost, high-volatile coal, using as a part of our device, a heating system already in place, and wherein the resultant structure .will have advantages of the original, furnace construction, but in addition,

housing encloses both of said heaters, so that the heated air aboutboth of said heaters is discharged through the customary room ducts leading from such a housing.

Further objects of the invention are to so construct a device of the kind described, that there is a self-feeding of the fuel within the primary burner, by gravity, and wherein the air is admitted for combustion from below the grate in the primary heater, there being a relatively short conduit or passage interconnecting said burner and heating drum at substantially the height of the grate within the primary heater, said grate projecting into this passage beyond the rear of the last-named heater, and wherein burning action takes place within this passageway.

Added objects of our invention are to so construct this device that an upright door or wall portion is provided below the grate and between the adjoining heater casings, this door being preferably swingingly mounted or otherwise movable, so that the burning of fuel is confined to the forward or primary heater, and with the additional advantage that any fly ash or other foreign matter or sediment will fall to the bottom behind this wall or door and may be removed easily while holding said door lifted, from in front of the primary heater. I

Many other objects and advantages of the construction herein shown and described, will be obvious to those skilled in the art to which this invention appertains, as will be more apparent from the disclosures herein given.

In the drawing, wherein like reference characters indicate like or corresponding parts throughout the views,

Figure 1 is a vertical sectional view through the heating device; and

of, our; present improved construction,

Figure 2 is a fragmentary cross-section, taken substantially along the. line :Z-.2 of Fig. 1. I Referring more particularly to the drawing,

wherein-,I-have. illustrated a preferred embodimentv of'my invention, in its simplest form, A

indicates generally a hot-air furnace, heating .drum'or heater of any size, shape and design, and provided with the usual firing or charging door l and ashdooropening 2. The. firing door ianearly alwaystoo high to be of use as a part and .is

sealed up. .The v grate too, is, not requiredas a part of our construction, v and this too, is removed, The outer shell or housing 3 is around the furnace casing and is provided with the required number of liot air ducts or passageways 4 in the usual manners- All of the foregoing furnace construction is to be found already in situ, and the said removals andseals are provided as enumerated and as will be more clearly apparent as the disclosure proceeds.

Our present invention has as its principal object the burning of low-cost, highly volatile bituminous coal without the use of a mechanical stoker, and we have found that we are able to do this while retaining most of the original hotair furnace structure. 7

What we will term our primary burner or heater is the structure that is to be combined with the furnace structure already in situ, this primary burner being arranged in front of the secondary heating drum and consisting of a shell 5 of the required capacity so as to hold a sulficient quantity .of fuel to serve over long periods of heating time, the fuel-receiving or magazine chamber 6 having the upper charging door 1, preferably with adjustable air-entrainment openings, the body of fuel being indicated at 8.

There is an ash chamber 9, with the closure door Ill thereat, into which the usual ash-receptacle H is removably inserted, said door l0 preferably having adjustment for varying the draft opening therethrough. However, there is an additional, permanent draft opening l2 immediately below the grate, as shown, thus insuring that at no time can all of the draft be shut off. This fuel to substantially the forward heater, this door being preferably swingingly mounted or otherwise movably mounted, as to be swung upwardly and out of the way whenever it is deemed necessary to remove any fly-ash or other foreign matter to the rear of this door. Such removal of sediment may be done through the front of With a structure as herein set forth, the cheap, high-volatile bituminous coals may be burned substantially smokelessly, and the simple addition of the primary heater into a heating system already in place, makes for a very economical and efficient installation. Obviously, thermostatic controls may be provided at the drafts at the charging door and through the ash pit, but these are not shown as they do not form a part of our invention.

Having thus described our invention, it is obvious that various immaterial modifications may be made in the same without departing from the spirit of our invention; hence we do not wish to be understood as limiting ourselves to the exact form, arrangement, combination of parts or construction herein shown or described, except the burner while maintaining the door l5 opened.

In operation, the ashes are shaken through the. grate l3, into the ash pit, and with hardly any ashes falling into the. original furnace pit. The original furnace charging door and any other opening not used are permanently sealed tightly as to. prevent, the escape of gases therethrough. The opening into the heater A at the duct or passageway M may be through the clinker door or'ash door of the former if these are found at the proper height and'of proper size for installation; otherwise,.the original doors are sealed,

and a fresh opening is made at the proper place and of proper size' through the side wall of the hot-air furnace A.

Itisto be stressed that the enclosure housing of the original furnace structure may be extended so as to include the additional structure,

somewhat as shown, and it is obvious that the heat radiated by either the original or additional burner structure will be effectively used to pass through the ro om ducts indicated.

by Letters Patent is :v

In a'h'eating device of the kind described, comprising a pair of heaters each having enclosing walls and only the forward of said heaters being provided with a substantially horizontal perforate grate forming, together with the enclosing wall-of said heater, a fuel chamber above the 'ingly -movably' supported immediately below said grate and positioned across said conduit.

NEAL VAN HOOSE. ROBERT J. HARDING. 

